The Data Discovery module makes sure that any confidential text or image data transmitted and stored by the users within the Exchange Online mailboxes, OneDrive storages and SharePoint Online sites of your organization will not leak to malicious users. By default, detected items containing confidential information are neither moved nor deleted, but displayed in the Quarantine list, so you can consider actions to prevent the possible leakage.
This section describes how to enable and configure tracing of the following types of confidential information in text and image presentation: